"""
pagamiago - free software script to send PayPal payments

Copyright (C) 2018 Alyssa Rosenzweig

This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program.  If not, see <https://www.gnu.org/licenses/>.
"""

import re

# Ensure that amounts are of the form "13.37" by checking against a regex
# This is the form PayPal uses at least for USD.
# TODO: International currencies


def amount(amount_str):
    return re.match("^([1-9]\d*|0)\.\d\d$", amount_str) is not None


def email(email_str):
    return re.match("^[^@]+@[^\.]+\..+", email_str) is not None
